Answer:
The correct answer is C.
Explanation:
A. Would be referring to multiplication. If you read the problem there is nothing to do with multiplication.
B. Is just 4. Positive or negative? You don't know because its just 4.
C. 4+h refers to 4 adding the extra years "h"
D. This would mean the senate does not serve longer and they serve lower.
Hope this helped!